diff --git a/application/runtime_composer.py b/application/runtime_composer.py
index ca280cf..a8fb059 100644
--- a/application/runtime_composer.py
+++ b/application/runtime_composer.py
@@ -84,7 +84,11 @@ def build_reporting_adapters(self):
             service_name=self.service_name,
             strategy_profile=self.strategy_profile,
             runtime_target=self.runtime_target,
-            account_scope=self.account_group,
+            account_scope=(
+                self.runtime_target.account_scope
+                if self.runtime_target and self.runtime_target.account_scope
+                else self.account_group
+            ),
             account_group=self.account_group,
             project_id=self.project_id,
             instance_name=self.instance_name,
diff --git a/runtime_config_support.py b/runtime_config_support.py
index 7fb8281..54d4980 100644
--- a/runtime_config_support.py
+++ b/runtime_config_support.py
@@ -505,7 +505,11 @@ def load_platform_runtime_settings(
             )
         ),
         account_group=account_group,
-        service_name=group_config.service_name,
+        service_name=first_non_empty(
+            os.getenv("K_SERVICE"),
+            runtime_target.service_name,
+            group_config.service_name,
+        ),
         account_ids=group_config.account_ids,
         tg_token=os.getenv("TELEGRAM_TOKEN"),
         tg_chat_id=os.getenv("QSL_GLOBAL_TELEGRAM_CHAT_ID") or os.getenv("GLOBAL_TELEGRAM_CHAT_ID"),
diff --git a/tests/test_runtime_composer.py b/tests/test_runtime_composer.py
index 6c4725f..251e383 100644
--- a/tests/test_runtime_composer.py
+++ b/tests/test_runtime_composer.py
@@ -26,7 +26,7 @@ def fake_reporting_builder(**kwargs):
         service_name="interactive-brokers-platform",
         strategy_profile="global_etf_rotation",
         strategy_domain="us_equity",
-        account_group="default",
+        account_group="shared-live",
         project_id="project-1",
         instance_name="ib-gateway",
         account_ids=("U123456",),
@@ -44,7 +44,7 @@ def fake_reporting_builder(**kwargs):
             platform_id="interactive_brokers",
             strategy_profile="global_etf_rotation",
             dry_run_only=True,
-            account_scope="default",
+            account_scope="us-combo-shadow",
             service_name="interactive-brokers-platform",
         ),
         strategy_config_source="env",
@@ -87,7 +87,8 @@ def fake_reporting_builder(**kwargs):
 
     assert notification_adapters.notification_port == "notification-port"
     assert observed["notification_builder"]["send_message"]
-    assert observed["reporting_builder"]["runtime_assembly"].account_scope == "default"
+    assert observed["reporting_builder"]["runtime_assembly"].account_scope == "us-combo-shadow"
+    assert observed["reporting_builder"]["runtime_assembly"].account_group == "shared-live"
     assert observed["reporting_builder"]["managed_symbols"] == ("AAA", "BIL")
     assert observed["reporting_builder"]["signal_effective_after_trading_days"] == 1
     assert observed["reporting_builder"]["runtime_assembly"].runtime_target.platform_id == "interactive_brokers"
diff --git a/tests/test_runtime_config_support.py b/tests/test_runtime_config_support.py
index a2c3491..c9c61a5 100644
--- a/tests/test_runtime_config_support.py
+++ b/tests/test_runtime_config_support.py
@@ -354,6 +354,32 @@ def test_load_platform_runtime_settings_supports_explicit_group_config_values(mo
     assert settings.notify_lang == "zh"
 
 
+def test_runtime_target_service_name_overrides_shared_account_group_service(monkeypatch):
+    monkeypatch.setenv(
+        "RUNTIME_TARGET_JSON",
+        runtime_target_json(
+            "us_equity_combo_leveraged",
+            dry_run_only=True,
+            deployment_selector="us-combo-shadow",
+            account_scope="us-combo-shadow",
+            service_name="interactive-brokers-us-combo-shadow-service",
+        ),
+    )
+    monkeypatch.setenv("ACCOUNT_GROUP", "shared-live")
+    monkeypatch.setenv(
+        "IB_ACCOUNT_GROUP_CONFIG_JSON",
+        '{"groups":{"shared-live":{"ib_gateway_instance_name":"ib-gateway",'
+        '"ib_gateway_mode":"live","ib_client_id":1,'
+        '"service_name":"interactive-brokers-quant-live-u18336562-service",'
+        '"account_ids":["U123456"]}}}',
+    )
+
+    settings = load_platform_runtime_settings(project_id_resolver=lambda: "project-1")
+
+    assert settings.account_group == "shared-live"
+    assert settings.service_name == "interactive-brokers-us-combo-shadow-service"
+
+
 def test_load_platform_runtime_settings_derives_hk_market_from_account_group(monkeypatch):
     monkeypatch.setenv("RUNTIME_TARGET_JSON", runtime_target_json(SAMPLE_STRATEGY_PROFILE))
     monkeypatch.setenv("ACCOUNT_GROUP", "hk-live")